Press-in creep testing machine clamp suitable for plate-shaped sample

Abstract

The invention provides a press-in creep testing machine clamp suitable for a plate-shaped sample, which is used for being connected with a creep testing machine and being matched with an extensometer so as to test the accurate deformation of the plate-shaped sample, and comprises: a connecting mechanism which is used for being connected with the creep testing machine and comprises a first connecting piece and a second connecting piece; the main body mechanism is connected with the connecting mechanism and comprises a first main body part connected with the first connecting piece and a second main body part connected with the second connecting piece, the first main body part and the second main body part are both rectangles with penetrating notches formed in the middles, and the first main body part and the second main body part penetrate through the penetrating notches to be mutually nested; the penetrating notch is used for placing a plate-shaped sample, and when the plate-shaped sample is placed in the penetrating notch, the first main body part and the second main body part respectively apply pressure to the direction of the plate-shaped sample from two sides.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical property testing, and in particular to a clamp of a press-in creep testing machine suitable for a plate-shaped sample. Background Art

[0002] Endurance and creep specimens include cylindrical specimens and plate specimens. Cylindrical specimens are mainly used for endurance and creep tests when there is sufficient material and no requirements on the specimen size. The specimens and fixtures are usually connected by threaded or suspended connections.

[0003] Plate specimens are mainly used for durability and creep tests of materials with limited size or thin plates. For example, in order to solve the safety problem during the operation of bus duct, the contact position between the bus duct conductive bar and the plug-in box is prone to aging, which will cause abnormal temperature rise in the aging part, or the joint will increase resistance due to poor contact, causing heat, and in severe cases, the joint will burn red. The creep of the conductive bar during long-term operation is one of the main reasons for the abnormal temperature rise of the joint. In order to obtain the data of the durability and creep performance of the conductive bar, the material needs to be processed into durability and creep specimens, and then tested using a durability and creep testing machine. When conducting durability and creep tests, the corresponding fixtures need to be equipped to fix the specimens on the creep testing machine.

[0004] However, the existing indentation creep test device is mainly suitable for cylindrical specimens, and the fixture installation is usually cumbersome and costly. In addition, the pin connection of traditional plate specimens is prone to the disadvantages of specimen clamping end breakage, pin breakage, pin deformation, etc. Summary of the invention

[0005] The present invention is made to solve the above-mentioned problems, and its object is to provide a clamp for a press-in creep testing machine suitable for plate-shaped specimens.

[0006] The present invention provides a clamp for a press-in creep testing machine suitable for a plate-like specimen, which is used to connect the creep testing machine and cooperate with an extensometer to test the precise deformation of the plate-like specimen. The clamp has the following characteristics: a connecting mechanism, which is used to connect the creep testing machine and includes a first connecting member and a second connecting member; and a main body mechanism, which is connected to the connecting mechanism and includes a first main body connected to the first connecting member and a second main body connected to the second connecting member. The first main body and the second main body are both rectangular with a through-notch in the middle. The first main body and the second main body are respectively nested through the through-notch. The through-notch is used to place the plate-like specimen. When the plate-like specimen is placed in the through-notch, the first main body and the second main body respectively apply pressure to the plate-like specimen from both sides.

[0007] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: wherein the middle sections of the first connecting member and the second connecting member are both provided with bosses protruding outward, and the bosses are used to clamp the extensometer.

[0008] In the indentation creep testing machine fixture suitable for plate-shaped specimens provided by the present invention, it can also have the following characteristics: wherein, one end of the first connecting member and the second connecting member are both provided with an external thread structure that matches the internal thread structure of the creep testing machine, so that the first connecting member and the second connecting member are respectively threadedly connected to the two creep testing machines.

[0009] In the indentation creep testing machine fixture suitable for plate-shaped specimens provided by the present invention, it can also have the following characteristics: wherein, the first main body and the second main body each include two support members and two baffles, the baffles of the first main body are arranged on both sides of the support member along the first direction, and the baffles of the second main body are arranged on both sides of the support member along the second direction, and the first direction is perpendicular to the second direction.

[0010] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: wherein the support member and the baffle are both provided with matching bolt holes, and the support member and the baffle are connected by passing the bolts through the bolt holes.

[0011] In the indentation creep testing machine fixture suitable for plate-like specimens provided by the present invention, it can also have the following characteristics: wherein, the first main body includes a first support member and a second support member, a first groove 26 matching the plate-like specimen is provided above the second support member, the second main body includes three support members and a fourth support member, the third support member is located between the first support member and the second support member, the second support member is located between the third support member and the fourth support member, and the plate-like specimen is arranged between the third support member and the second support member.

[0012] The indentation creep testing machine fixture suitable for plate-shaped specimens provided by the present invention may also have the following features: wherein the first connecting member is connected to the first supporting member, and the second connecting member is connected to the fourth supporting member.

[0013] In the indentation creep testing machine fixture suitable for plate-like specimens provided by the present invention, it can also have the following characteristics: wherein, the first main body includes a first baffle and a second baffle, the second main body includes a third baffle and a fourth baffle, the first baffle and the second baffle are respectively arranged on both sides of the first support member and the second support member along the first direction, the third baffle and the fourth baffle are respectively arranged on both sides of the third support member and the fourth support member along the second direction, and the plate-like specimen is arranged between the first baffle, the second baffle, the third baffle and the fourth baffle.

[0014] In the indentation creep testing machine fixture suitable for plate-shaped specimens provided by the present invention, it can also have the following characteristics: wherein, the length of the first baffle and the second baffle in the second direction is the same as the length of the first support member and the second support member in the second direction, the length of the first baffle and the second baffle in the third direction is the same as the distance between the first support member and the second support member, the length of the third baffle and the fourth baffle in the first direction is the same as the length of the third support member and the fourth support member in the first direction, the length of the third baffle and the fourth baffle in the third direction is the same as the distance between the third support member and the fourth support member, the third direction is perpendicular to the first direction and the second direction respectively, and the area of ​​the first baffle and the second baffle is larger than the area of ​​the third baffle and the fourth baffle.

[0015] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following characteristics: wherein the materials of the connection mechanism and the main body mechanism are equiaxed high-temperature alloys, directionally solidified high-temperature alloys or single-crystal high-temperature alloys.

[0016] Functions and Effects of the Invention

[0017] According to the indentation creep testing machine fixture suitable for plate-like specimens involved in the present invention, the present invention includes a connecting mechanism and a main body mechanism, which is well suitable for plate-like specimens, and by refining them into different parts, it is easy to install and reduces costs; the connection between the specimen and the fixture of the present invention adopts a clamping end suspension method, and cooperates with the clamping parts to reduce the stress concentration at the edge of the specimen, thereby overcoming the disadvantages of the specimen clamping end breakage, pin breakage, pin deformation and the like that are easily caused by the pin connection of the traditional plate-like specimen, reducing the probability of test failure, and avoiding problems such as inaccurate data and waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of a clamp in an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the assembly of a clamp in an embodiment of the present invention;

[0020] Figure 3 is a left side view of the clamp in an embodiment of the present invention; and

[0021] Figure 4 It is a front view of the clamp in the embodiment of the present invention. DETAILED DESCRIPTION

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and drawings specifically illustrate the clamp of the indentation creep testing machine suitable for plate-shaped specimens of the present invention.

[0024] Figure 1 is an exploded view of a clamp in an embodiment of the present invention. Figure 2 Schematic diagram of the assembly of the clamp in the embodiment of the present invention. Figure 3 It is a left side view of the clamp in the embodiment of the present invention. Figure 4 It is a front view of the clamp in the embodiment of the present invention.

[0025] Here, x represents the first direction, y represents the second direction, and z represents the third direction.

[0026] like Figure 1-4 As shown, the indentation creep tester fixture 100 for plate-like specimens in this embodiment is used to connect the creep tester and cooperate with the extensometer to test the precise deformation of the plate-like specimen 40, including the connection mechanism 10 and the main body mechanism. In the case of low working temperature, for example, the normal working temperature of the bus duct is 110℃~130℃, 45 steel is generally used to meet the strength. In the case of higher temperature requirements, the connection mechanism 10 and the main body mechanism can be made of equiaxed crystal high temperature alloy, directional solidification high temperature alloy and single crystal high temperature alloy. It can withstand high temperatures above 1000℃, and of course other materials with higher temperature resistance and higher strength can also be selected.

[0027] The connecting mechanism 10 is used to connect the creep testing machine, and comprises a first connecting member 11 and a second connecting member 12. The middle sections of the first connecting member 11 and the second connecting member 12 are both provided with a boss 13 protruding outwards, and the boss 13 is used to clamp the extensometer.

[0028] The first connecting member 11 is connected to the first supporting member 21, and the second connecting member 12 is connected to the fourth supporting member 32. Specifically, the first connecting member 11 and the second connecting member 12 are respectively provided with a first external thread structure 14 at one end and a second external thread structure 15 at the other end, and the boss 13 is arranged between the first external thread structure 14 and the second external thread structure 15.

[0029] The first external thread structure 14 cooperates with the internal thread structure of the creep testing machine, so that the first connecting member 11 and the second connecting member 12 can be threadedly connected to the two creep testing machines respectively.

[0030] The creep testing machine can apply tensile force to the clamp through the connecting mechanism 10 , and the extensometer can measure the displacement degree of the clamp after the creep testing machine applies force. The displacement is used to calculate the deformation amount of the plate specimen 40 , thereby conducting a mechanical property experiment of the plate specimen 40 .

[0031] The main body mechanism is connected to the connecting mechanism 10 , and includes a first main body portion 20 connected to the first connecting member 11 and a second main body portion 30 connected to the second connecting member 12 .

[0032] The first main body 20 and the second main body 30 are both rectangles with through slots in the middle, namely the first through slot 25 and the second through slot 36. The first main body 20 and the second main body 30 respectively pass through the first through slot 25 and the second through slot 36 to be nested with each other. The through slots are used to place the plate-like specimen 40. When the plate-like specimen 40 is placed in the through slots, the first main body 20 and the second main body 30 are respectively pulled outward from both sides toward the plate-like specimen 40, thereby causing the plate-like specimen 40 to deform.

[0033] The first main body 20 and the second main body 30 each include two support members and two baffles. The baffles of the first main body 20 are arranged on both sides of the support member along the first direction, and the baffles of the second main body 30 are arranged on both sides of the support member along the second direction. The first direction is perpendicular to the second direction.

[0034] The thickness of the support member is greater than 50% of the thickness of the plate-shaped test piece 40 .

[0035] The support member and the baffle are both provided with matching bolt holes, and the support member and the baffle are connected by passing the bolts through the bolt holes.

[0036] The first main body 20 includes a first support member 21 and a second support member 22. A first groove 26 matching with the plate-like specimen 40 is provided above the second support member 22 for clamping the plate-like specimen 40. The second main body 30 includes three support members and a fourth support member 32. A second groove 37 is provided below the third support member 31. A protrusion 35 is provided in the second groove 37. The width of the protrusion 35 is greater than the width of the plate-like specimen 40 and fits tightly with the plate-like specimen 40. The third support member 31 is located between the first support member 21 and the second support member 22. The second support member 22 is located between the third support member 31 and the fourth support member 32. The plate-like specimen 40 is arranged between the third support member 31 and the second support member 22.

[0037] A threaded hole 51 with an internal thread structure is respectively provided above the first support member 21 and below the fourth support member 32. The second external thread structures 15 of the first connecting member 11 and the second connecting member 12 pass through the threaded holes 51 and are threadedly connected to the first support member 21 and the fourth support member 32, respectively, thereby realizing the connection between the connecting mechanism and the main mechanism.

[0038] The first main body 20 includes a first baffle 23 and a second baffle 24, and the second main body 30 includes a third baffle 33 and a fourth baffle 34. The first baffle 23 and the second baffle 24 are respectively arranged on both sides of the first support member 21 and the second support member 22 along the first direction, the third baffle 33 and the fourth baffle 34 are respectively arranged on both sides of the third support member 31 and the fourth support member 32 along the second direction, and the plate-shaped sample 40 is arranged between the first baffle 23, the second baffle 24, the third baffle 33 and the fourth baffle 34.

[0039] The length of the first baffle 23 and the second baffle 24 in the second direction is the same as the length of the first support member 21 and the second support member 22 in the second direction, the length of the first baffle 23 and the second baffle 24 in the third direction is the same as the distance between the first support member 21 and the second support member 22, the length of the third baffle 33 and the fourth baffle 34 in the first direction is the same as the length of the third support member 31 and the fourth support member 32 in the first direction, the length of the third baffle 33 and the fourth baffle 34 in the third direction is the same as the distance between the third support member 31 and the fourth support member 32, the third direction is perpendicular to the first direction and the second direction respectively, and the area of ​​the first baffle 23 and the second baffle 24 is larger than the area of ​​the third baffle 33 and the fourth baffle 34.

[0040] Therefore, holes 50 are respectively provided on both sides of the first baffle 23 and the second baffle 24 in the third direction, and holes 50 are also respectively provided on both ends of the first support member 21 and the second support member 22 in the first direction, wherein the holes 50 at the upper ends of the first baffle 23 and the second baffle 24 are respectively connected to the first support member 21 by bolts, and the holes 50 at the lower ends of the first baffle 23 and the second baffle 24 are respectively connected to the second support member 22 by bolts.

[0041] The four corners of the third baffle 33 and the fourth baffle 34 are also provided with holes 50, and the ends of the third support member 31 and the fourth support member 32 are also provided with penetrating holes 50, and the third baffle 33, the fourth baffle 34 and the third support member 31, the fourth support member 32 are connected by bolts.

[0042] The method of using the indentation creep testing machine fixture 100 suitable for plate-shaped specimens is as follows:

[0043] S1. Connect the first support member 21 and the second support member 22 through the first baffle 23 and the second baffle 24 to form a first main part, and place the sample on the second support member 22.

[0044] S2. Place the three support members between the first support member 21 and the sample, place the fourth support member 32 below the second support member 22, connect the third support member 31 and the fourth support member 32 through the third baffle 33 and the fourth baffle 34 to form a second main part. At this time, the sample is located between the third support member 31 and the second support member 22.

[0045] S3. The two creep testers are respectively threadedly connected to the first connecting member 11 and the second connecting member 12, and a tensile force is applied to the entire clamp through the first connecting member 11 and the second connecting member 12.

[0046] S4. Connect the extensometer to the boss 13 to measure the displacement of the fixture and the deformation of the sample, so as to conduct a mechanical property test.

[0047] Functions and Effects of the Embodiments

[0048] According to the indentation creep testing machine fixture suitable for plate-like specimens involved in the present invention, the present invention includes a connecting mechanism and a main body mechanism, which is well suitable for plate-like specimens, and by refining them into different parts, it is easy to install and reduces costs; the connection between the specimen and the fixture of the present invention adopts a clamping end suspension method, and cooperates with the clamping parts to reduce the stress concentration at the edge of the specimen, thereby overcoming the disadvantages of the specimen clamping end breakage, pin breakage, pin deformation and the like that are easily caused by the pin connection of the traditional plate-like specimen, reducing the probability of test failure, and avoiding problems such as inaccurate data and waste of resources.

[0049] The present invention can be assembled with fixture parts of different specifications to meet the needs of different sizes. The bolt connection ensures that the creep test load requirements in most cases can be met. The spacer assembly and the plate-shaped specimen are fixed with bolts, and the tightness of the nuts can be adjusted to make the entire connection system achieve optimal coaxiality, thereby avoiding the adverse effects of inaccurate coaxiality of the plate-shaped specimen on the test results when the pin is connected, and facilitating the entire connection system to achieve optimal coaxiality.

[0050] The structure of the present invention is not only suitable for high temperature endurance and creep tests of plate-like specimens, but also suitable for mechanical property tests such as room temperature and high temperature press-in creep, tension-tension fatigue, and compression fatigue of plate-like specimens.

[0051] In the present invention, the areas of the third baffle and the fourth baffle are significantly larger than those of the first baffle and the second baffle, and can well provide a more uniform force during the pressing process.

[0052] The present invention selects equiaxed crystal high temperature alloy, directionally solidified high temperature alloy or single crystal high temperature alloy as the main material, which can withstand high temperature above 1000C.

[0053] The present invention provides a first groove 26 above the second support member to facilitate placement of the plate-shaped sample and prevent the plate-shaped sample from falling off during the experiment.

[0054] In the present invention, a second groove 37 is disposed below the third support member, and a convex block 35 is disposed in the second groove 37. The convex block 35 can cooperate well with the plate-shaped sample, so that the contact between the plate-shaped sample and the third support member is closer.

[0055] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A clamp for a plate-like specimen in a creep tester, used to connect a creep tester and cooperate with an extensometer to test the precise deformation of the plate-like specimen, characterized in that: include: A connecting mechanism, used to connect the creep testing machine, comprising a first connecting member and a second connecting member; as well as The main body mechanism is connected to the connecting mechanism, and includes a first main body portion connected to the first connecting member and a second main body portion connected to the second connecting member. The first main body portion and the second main body portion are both rectangles with a through-notch in the middle. The first main body portion and the second main body portion are respectively nested with each other through the through-notch. The through-notch is used to place the plate-like specimen. When the plate-like specimen is placed in the through-notch, the first main body portion and the second main body portion respectively apply pressure in the direction of the plate-like specimen from both sides.

2. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, The middle sections of the first connecting member and the second connecting member are both provided with bosses protruding outwards, and the bosses are used to clamp the extensometer.

3. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, One end of the first connecting member and the second connecting member are both provided with an external thread structure matching with the internal thread structure of the creep testing machine, so that the first connecting member and the second connecting member are respectively threadedly connected to the two creep testing machines.

4. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, The first main body and the second main body each include two support members and two baffles. The baffles of the first main body are arranged on both sides of the support member along a first direction, and the baffles of the second main body are arranged on both sides of the support member along a second direction. The first direction is perpendicular to the second direction.

5. The clamp for the indentation creep testing machine suitable for plate-shaped specimens according to claim 4, characterized in that: in, The support member and the baffle are both provided with matching bolt holes, and the support member and the baffle are connected by passing bolts through the bolt holes.

6. The indentation creep testing machine fixture for plate-shaped specimens according to claim 4, characterized in that: in, The first main body includes a first support member and a second support member, a groove matching the plate-shaped specimen is provided above the second support member, the second main body includes a third support member and a fourth support member, the third support member is located between the first support member and the second support member, the second support member is located between the third support member and the fourth support member, and the plate-shaped specimen is arranged between the third support member and the second support member.

7. The clamp for the indentation creep testing machine suitable for plate-shaped specimens according to claim 6, characterized in that: in, The first connecting member is connected to the first supporting member, and the second connecting member is connected to the fourth supporting member.

8. The indentation creep testing machine fixture for plate-shaped specimens according to claim 6, characterized in that: in, The first main body portion includes a first baffle and a second baffle, the second main body portion includes a third baffle and a fourth baffle, the first baffle and the second baffle are respectively arranged on both sides of the first support member and the second support member along the first direction, the third baffle and the fourth baffle are respectively arranged on both sides of the third support member and the fourth support member along the second direction, and the plate-shaped specimen is arranged between the first baffle, the second baffle, the third baffle and the fourth baffle.

9. The clamp for the indentation creep testing machine suitable for plate-shaped specimens according to claim 8, characterized in that: in, The length of the first baffle and the second baffle in the second direction is the same as the length of the first support member and the second support member in the second direction, the length of the first baffle and the second baffle in the third direction is the same as the distance between the first support member and the second support member, the length of the third baffle and the fourth baffle in the first direction is the same as the length of the third support member and the fourth support member in the first direction, the length of the third baffle and the fourth baffle in the third direction is the same as the distance between the third support member and the fourth support, the third direction is perpendicular to the first direction and the second direction respectively, and the areas of the first baffle and the second baffle are larger than the areas of the third baffle and the fourth baffle.

10. The indentation creep testing machine fixture suitable for plate-shaped specimens according to claim 1, characterized in that: in, The materials of the connecting mechanism and the main body mechanism are equiaxed crystal high temperature alloy, directionally solidified high temperature alloy or single crystal high temperature alloy.

Images